CBSE > Class 08 > Science | CBSE Board | Homework Help

CO2 cuts the supply of oxygen(air) which is a requirement for combustion so combustion needs air, heat, fuel if one of them is not there then the combustion wouldn't take place.

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Ayesha Khatua 6 years, 2 months ago

Carbon dioxide doesn't allow to enter the oxygen to the burning place to be burned so,... ..

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What do you understand by the term migration?

Posted by Kunika Khandelwal 6 years, 2 months ago

CBSE > Class 08 > Science

2 answers

Puskar Raj 6 years, 2 months ago

Moving one place to another place in search of food.

1Thank You

Manasvi Mishra 6 years, 2 months ago

Migration is the phenomenon of movement of a species from its own habitat to some other habitat for a particular time period every year for a specific purpose like breeding.

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ANSWER

Explain why chloroplasts are found only in plant cells?

Posted by Kunika Khandelwal 6 years, 2 months ago

CBSE > Class 08 > Science

2 answers

Puskar Raj 6 years, 2 months ago

Chloroplast is a type of plastids and plastid is not present in the plants

1Thank You

Ayesha Khatua 6 years, 2 months ago

Chloroplast contain chlorophyll so,chlorophyll contain green pigmebt so,it give green colour to the plant's leave.and plant can't survive without doing photosynthesis process which required laeve to respire.

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ANSWER

Who is the founder of cell

Posted by Krish Deshmukh 6 years, 2 months ago

CBSE > Class 08 > Science

7 answers

Puskar Raj 6 years, 2 months ago

Robert Hooke was the founder of the cell

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Lakshya Topani 6 years, 2 months ago

Robert Hooke founded cell in a cork in 1665.

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Manasvi Mishra 6 years, 2 months ago

Robert Hooke

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Rahat Jalal 6 years, 2 months ago

Robert Hooke

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Polak Das 6 years, 2 months ago

Robert Hooke

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Harshita Singh 6 years, 2 months ago

Robert hooke in 1665

2Thank You

Faris Sansare 6 years, 2 months ago

Schleiden and schwann

2Thank You

ANSWER

What is bakelite

Posted by Yoshita Chatterjee 6 years, 2 months ago

CBSE > Class 08 > Science

4 answers

Puskar Raj 6 years, 2 months ago

Bakelite is a poor conductor of heat as well as electricity

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Manasvi Mishra 6 years, 2 months ago

1.Baketile is poor conductor of heat and electricity 2.it is used to make electrical switches,handles of various utensils,etc.

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Aditya Khatak 6 years, 2 months ago

It is bad conductor of heat and it is also used to make various things

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Manchita Barman 6 years, 2 months ago

It is a plastic made from synthetic components. It is used to make bangles, buttons and etc.?

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What is the age of adolescence

Posted by Karishma Karishma 6 years, 2 months ago

CBSE > Class 08 > Science

4 answers

Ritu Sharma 6 years, 1 month ago

The period of time in which body undergoes changes,leading to reproductive maturity is called adolescence. It starts from the age of 11 or 12 and end in the age of 18 or 19

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Puskar Raj 6 years, 2 months ago

Age between childhood and adulthood starts from 12 years and ends in 18 years

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Kunika Khandelwal 6 years, 2 months ago

It starts from the age of 11 or 12 and ends at the age of 18 or 19

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Krish Deshmukh 6 years, 2 months ago

Adolescence is the period of life in which organism can reproductively active

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What is exact definition for acid

Posted by Bhuvana Prabhu 6 years, 2 months ago

CBSE > Class 08 > Science

2 answers

Krish Deshmukh 6 years, 2 months ago

a liquid substance that can dissolve metal and may burn your skin or clothes. Acids have a pH value of less than 7

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Indhuja Umapathy 6 years, 2 months ago

Acids are chemicals that react with litmus to turn it red

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ANSWER

What are fundamental rights

Posted by Aditya Deshetty 6 years, 2 months ago

CBSE > Class 08 > Science

1 answers

Manasvi Mishra 6 years, 2 months ago

1.Right to equality 2.Right to freedom 3.Right against Exploitation 4.Right to freedom of religion 5.Culture and educational rights 6.Right to constitutional remedies.

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ANSWER

Definition of algae

Posted by Varsha Rai 6 years, 2 months ago

CBSE > Class 08 > Science

2 answers

Manchita Barman 6 years, 2 months ago

A group of plants which is mostly aquatic. There body is not divided into root, stem and leaf.

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Anuranjan Nirala 6 years, 2 months ago

There is no proper divination of algae but in simple they are the plant like organising belong from protista group of plant

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Whet is metal

Posted by Neel Khurana 6 years, 2 months ago

CBSE > Class 08 > Science

4 answers

Pravin Mahida 6 years, 2 months ago

'fi

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Indhuja Umapathy 6 years, 2 months ago

Metals are materials with high tensile strength, malleable, ductile,and a good conductor of heat and electricity

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Krisha Zala 6 years, 2 months ago

Metal is a element which have different characteristics ex;- lustrous,Melleability,Ductiliy,good conductors of heat and electricity metals have two types of properties called physical and chemical property

2Thank You

Rj Rockstar 6 years, 2 months ago

Metal is a solid substance

2Thank You

ANSWER

Full form of P E T

Posted by Zeel Patel 6 years, 2 months ago

CBSE > Class 08 > Science

3 answers

Puskar Raj 6 years, 2 months ago

Poly Ethene Tetrephathalate

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Polak Das 6 years, 2 months ago

P E T ( polyethylene terephthalate

1Thank You

Anuranjan Nirala 6 years, 2 months ago

Poly ethylene terephatlene

2Thank You

ANSWER

What is natural resources

Posted by Neel Khurana 6 years, 2 months ago

CBSE > Class 08 > Science

2 answers

Puskar Raj 6 years, 2 months ago

Resources which occur in nature

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Krisha Zala 6 years, 2 months ago

The resources which get from nature us called natural resources like water,air,sunlight these are natrual resources

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Define adolwsence

Posted by Md Amaan 6 years, 2 months ago

CBSE > Class 08 > Science

1 answers

Md Amaan 6 years, 2 months ago

Period of human in which human body undergoes change in reproductive maturity is called

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Full form of PCRA ?

Posted by Mithilesh Jha 6 years, 2 months ago

CBSE > Class 08 > Science

3 answers

Priyank Tripathi 6 years, 2 months ago

PCRA: Petroleum Conservation Research Association

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Harini N 6 years, 2 months ago

Petroleum conservation research association

1Thank You

Harini N 6 years, 2 months ago

Petroleum conservation resource association

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Explain why sportsmen use shoes with spikes?

Posted by Mithilesh Jha 6 years, 2 months ago

CBSE > Class 08 > Science

2 answers

Kunika Khandelwal 6 years, 2 months ago

Sportsmen use shoes with spikes to make the friction between their shoes and the surface. This do not allow them to slip on the floor while they run or play

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Khilander Kumar 6 years, 2 months ago

Sportsmen use shoes with spike because the ground is plane and smooth .When both the things are of similar so sportsmen or we are not able to run on the field.That's why sportsmen shoes are with spike so they decrease the level of smooth and they are able to run.

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ANSWER

Who discovered Anthrax disease?

Posted by Mithilesh Jha 6 years, 2 months ago

CBSE > Class 08 > Science

2 answers

Zeel Patel 6 years, 2 months ago

Robert koch

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Harini N 6 years, 2 months ago

Robert koch

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What is full name of NPK?

Posted by Mithilesh Jha 6 years, 2 months ago

CBSE > Class 08 > Science

1 answers

Nippon Mondal 6 years, 2 months ago

N=nitrogen, P=phosphorus and K=potassium

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ANSWER

explain why sholder bags are provided with broad straps not thin straps

Posted by Sugandha Dubey 6 years, 2 months ago

CBSE > Class 08 > Science

2 answers

Anuranjan Nirala 6 years, 2 months ago

For minimise friction

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Sugandha Dubey 6 years, 2 months ago

I do'nt know

2Thank You

ANSWER

If "N "in pink is nitrogen. What is "P" AND "K"

Posted by Shine Rai 6 years, 2 months ago

CBSE > Class 08 > Science

2 answers

Arjun Khatri 6 years, 2 months ago

Phospgorus and potassium

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Sugandha Dubey 6 years, 2 months ago

phosphorus and potassium

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Differences between LPG amd CNG

Posted by Aiswariya Kanhar 6 years, 2 months ago

CBSE > Class 08 > Science

2 answers

Kunika Khandelwal 6 years, 2 months ago

LPG is used as a fuel for home and industry while CNG is used for power generation. It is now being used as a fuel for transport vehicles because it is less polluting fuel than petrol or diesel. The great advantage of CNG is that it burns directly for cooking in other uses.

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Yogita Ingle 6 years, 2 months ago

CNG	LPG
Its primary use is as an alternative for fuel in automobiles.	It has various uses such as heating and cooking in homes. They also have many other uses such as industrial and agricultural uses as well.
The primary component in CNG is methane.	The primary component in LPG is propane and Butane.
It produces very little greenhouse gases.	It produces carbon dioxide as a greenhouse gas and is much cleaner compared to gasoline.
It is very safe as it disperses rapidly into the air.	It is highly flammable as it is much heavier than air.
The primary source of obtaining CNG is from oil wells, bed methane wells, coal wells and even natural gas wells.	The main source of obtaining LPG is from the process of extracting natural gas from the reservoir.

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How to write a letter in Hindi

Posted by Aditya Deshetty 6 years, 2 months ago

CBSE > Class 08 > Science

1 answers

Pooja Madhu 6 years, 2 months ago

The same steps in english

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ANSWER

Difference between eukaryotic cell and prokaryotic cell

Posted by Arman Pradhan 6 years, 2 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 6 years, 2 months ago

	Prokaryotes	Eukaryotes
Type of Cell	Always unicellular	Unicellular and multi-cellular
Cell size	Ranges in size from 0.2 μm – 2.0 μm in diameter	Size ranges from 10 μm – 100 μm in diameter
Cell wall	Usually present; chemically complex in nature	When present, chemically simple in nature
Nucleus	Absent	Present
Ribosomes	Present. Smaller in size and spherical in shape	Present. Comparatively larger in size and linear in shape
DNA arrangement	Circular	Linear
Mitochondria	Absent	Present
Cytoplasm	Present, but cell organelles absent	Present, cell organelles present

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Who is robert hook

Posted by Ashi Shakya 6 years, 2 months ago

CBSE > Class 08 > Science

2 answers

Kunika Khandelwal 6 years, 2 months ago

Robert hooke was a scientist who discovered cell

1Thank You

Yogita Ingle 6 years, 2 months ago

In1665, Robert Hooke examined a thin slice of cork and observed that it consists of many little compartments, resembling a honeycomb structure. He made this observation through a self-designed microscope. He termed these boxes as cells, which is a Latin word for ‘a little room".

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ANSWER

Differences between charged objects and uncharged objects

Posted by Naman Kumar 6 years, 2 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

An object having no electric charge on it is called an uncharged object whereas an object having electric charge on it is called a charged object.

If we take a used ball pen refill and rub it vigorously with a piece of polythene. Then bring it close to small pieces of paper. It attracts pieces of paper. When a plastic refill is rubbed with polythene, it acquires a small electric charge. Similarly, when a plastic comb is rubbed with dry hair, it acquires a small charge. These objects are called charged objects.

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